10.2 Development of the placental villi


Connections between maternal and fetal tissues


Placental tissue structure

Maternal and fetal tissues form two units that are closely bound together at the placental level.

Quiz

Quiz 12
 

The fetal part of the placenta is made up of the chorionic plate with its placental villi, the cytotrophoblast layer and the intervillous spaces. The chorionic plate (great part of the placenta on the fetal side) consists of the amnion, the extra-embryonic mesenchyma, the cytotrophoblast and the syncytiotrophoblast.

 

The basal plate, the peripheral region of the placenta on the maternal side that is in contact with the uterine wall, is made up of two tissues: embryonic tissue (cytotrophoblast, syncytiotrophoblast), on the one side, and of maternal tissue (decidua basalis) on the other.



The maternal side of the placenta is made up of the decidua basalis, uterine vessels and glands.


Fig. 27 - Chorionic plate Fig. 28 - Basal plate  Legend

1
2
3
4
 Amnion
Extra-embryonic mesoblast
Cytotrophoblast
Syncytiotrophoblast

5
6
7
8
 Zona compacta
Zona spongiosa
Decidua basalis
Myometrium

The chorionic plate (Fig. 27) (namely the fetal part of the placenta) and the basal plate (Fig. 28), (maternal part of the placenta) form two units closely connected at the placental level.


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